Bi-fold door



FIG. 1 is a front perspective view of a first bi-fold door;

FIG. 2 is a front elevational view, with the rear view being a mirrorimage thereof;

FIG. 3 is a front perspective view of a second bi-fold door; and,

FIG. 4 is a front elevational view, with the rear view being a mirrorimage thereof.

The broken lines depict portions of the bi-fold door that form no partof the claimed design.

CLAIM The ornamental design for a bi-fold door, as shown and described.